package com.hmdp.service.impl;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {

    @Resource
    StringRedisTemplate stringRedisTemplate;

    @Resource
    private IShopTypeService typeService;




    //使用使用redis的string类型实现的


    @Override
    public Result

    queryTypeAll() {

        String key = "cache:shopType:all";

        //1.从redis查询店铺类型
        String shopTypeJson = stringRedisTemplate.opsForValue().get(key);

        //2.判断是否存在
        if (StrUtil.isNotBlank(shopTypeJson)){

            //3.存在直接返回
            List<ShopType> shopTypes = JSONUtil.toList(JSONUtil.parseArray(shopTypeJson), ShopType.class);

            return Result.ok(shopTypes);
        }

        //4.不存在，查询shop_type的数据库

        List<ShopType> shopTypes = typeService.query().orderByAsc("sort").list();

        //5.不存在，返回错误isEmpty()TRUE 代表没有元素，FALSE 代表有元素
        if (shopTypes.isEmpty()){
            return Result.fail("店铺类型不存在");
        }

        //6.存在写入redis
        stringRedisTemplate.opsForValue().set(key,JSONUtil.toJsonStr(shopTypes));


        return Result.ok(shopTypes);
    }
}
